INFLUENCE OF TEMPERATURE ON THE PHYSICAL PROPERTIES OF VEGETABLE OILS

Abstract

The aim of this study is to investigate the influence of temperature (20 - 80°C) on the physical properties of vegetable oils and to establish some correlations between them. In this study were studied eight types of vegetable oils as: olive oil, corn oil, sunflower oil, grape seeds oil, squash oil, hazelnut oil, peanut oil and sesame oil. The temperature influences negatively almost all the physical parameters measured (exception isentropic compressibility and Rao´s molar sound function). A master curve of the correlation between the experimental data of oil samples density, surface tension and ultrasound velocity was achieved (R² = 0.996). The correlation between surface tension and viscosity was made using Pelofsky, modified Pelofsky, exponential and polynomial models, the second one fits better the experimental data.